STMicroelectronics STTH3R02Q

Overview

STTH3R02Q from STMicroelectronics is a 200 V, 3 A ultrafast recovery diode in DO-15 package, featuring 16 ns typical reverse recovery time (trr), 0.70–0.85 V forward voltage at 100–150 °C, and 175 °C maximum junction temperature. It is engineered for low-voltage, high-frequency inverters, freewheeling paths, and polarity protection in switching-mode base drive circuits.

For engineers reviewing the STTH3R02Q datasheet, STTH3R02Q pinout, STTH3R02Q application, or STTH3R02Q equivalent, key selection criteria include its ultrafast trr performance under high dIF/dt conditions, low conduction losses at elevated Tj, and thermal robustness in compact DO-15 through-hole packaging.

Technical Context

This diode employs ST's planar platinum-doped silicon technology to achieve negligible switching losses and very low conduction losses. Its dynamic behavior is characterized by tightly controlled reverse recovery parameters-trr = 16 ns (typ) at IF = 1 A, dIF/dt = −100 A/µs, VR = 30 V, Tj = 25 °C-and stable IRM ≤ 4.5 A under harsh conditions (IF = 3 A, dIF/dt = −200 A/µs, VR = 160 V, Tj = 125 °C).

The device operates with low thermal resistance: Rth(j-l) = 45 °C/W (DO-15, lead length = 10 mm on infinite heatsink), enabling reliable power dissipation in space-constrained industrial converters. Its VF remains below 0.85 V at 100 °C and 3 A, supporting efficient operation across wide temperature ranges without derating penalties.

Key Specifications

Pinout & Package

Packaged in DO-15 (JEDEC DO-15), this axial-leaded diode has two terminals: anode (A) and cathode (K). The cathode is marked by a band on the body. Lead spacing is 2.95–3.53 mm, body diameter 6.05–6.75 mm, and overall length 26–31 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultrafast diode applications.

Compared with STTH3L02Q and MBR320RLG, STTH3R02Q uniquely balances ultrafast trr (16 ns), low VF stability over temperature, and high-temperature reliability-making it optimal for industrial inverters and motor drives requiring both speed and thermal resilience.

Availability

STTH3R02Q is available at Aetrix Electronics and suitable for DC-DC converter output rectification, motor drive freewheeling, and input polarity protection requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for STTH3R02Q includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STTH ultrafast diode product line targets high-efficiency power conversion systems-including SMPS, inverters, and motor controls-where low switching loss and thermal robustness are critical design constraints.

FAQ

What is the maximum allowable soldering temperature for STTH3R02Q?

The maximum lead temperature for soldering is 230 °C for 10 seconds at 4 mm from the case, per datasheet Table 2. Exceeding this risks internal bond wire damage or die attach degradation. Use controlled thermal profiles and avoid prolonged dwell above 210 °C.

Can STTH3R02Q replace a standard PN diode in a 100 kHz flyback converter?

Yes-its 16 ns trr and low stored charge (QRR ≈ 15 nC at 125 °C) reduce switching loss and EMI compared to standard PN diodes (trr > 100 ns). Measured efficiency gain is typically 1.2–1.8% at full load, confirmed in ST application note AN4155 for flyback topologies.

Is STTH3R02Q RoHS and REACH compliant?

Yes-STTH3R02Q is manufactured in ECOPACK®-compliant DO-15 packaging meeting RoHS Directive 2011/65/EU and REACH Regulation (EC) No. 1907/2006. Full compliance documentation, including substance declarations, is available via ST's Quality Portal using order code STTH3R02Q.

Does STTH3R02Q require a heatsink in a 3 A continuous application?

No-when mounted on a standard FR4 PCB with 10 mm lead length, its Rth(j-l) = 45 °C/W results in ~135 °C junction rise at 3 A (Pcond ≈ 2.5 W), staying within the 175 °C limit. For ambient >60 °C or sustained 100% duty cycle, add minimal copper pour (≥2 cm² per lead) as thermal relief.